JPH10200979A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shield an electric circuit from an external space, to easily transmit vibration of a diaphragm to the external space and to improve shielding effect like waterproofing, etc., by hermetically sealing a magnetic field generating part by casing and shielding it from the external space. SOLUTION: By a magnetic field generating part 40, an electric signal of sound is outputted to an amplifier circuit 42 by a sound source 41 of an electric circuit part 43 and the amplified electric signal is outputted to an air-core coil 31 of a loudspeaker unit 7 with lead wire 51. A magnetic field B is generated by the air-core coil 31 by the outputted electric signal, the magnetic field B reaches near a ringing part 20 by transmitting a casing 11. A permanent magnet 61 vibrates by interaction of the magnetic field B and a magnetic field generated by the permanent magnet 61, a ringing part 20 rings by vibration of a diaphragm 21 provided integrally with the permanent magnet 61 and the sound is generated by a loudspeaker 10. The casing 11 is formed from, for example, non-magnetic material like plastic, etc., provided with waterproof and shielding, for example, waterproofing, etc., from the external space S is performed for an internal part of the casing 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker, and more particularly, to a loudspeaker that generates vibrations in an audible frequency range, wherein the loudspeaker can be shielded from an electric circuit.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional speaker. Reference numeral 1 denotes a speaker, 2 denotes a diaphragm, 3 denotes a coil, 4 denotes an electric circuit, 5 denotes a lead wire, and 6 denotes a permanent magnet. .

In such a speaker 1, a coil 3 is integrated with a diaphragm 2, and an electric signal from an electric circuit 4 is supplied to the coil 3 via a lead wire 5 arranged on the diaphragm 2. Dynamic magnetic field generated in 3 and fixed permanent magnet 6
The vibrating force generated in the coil 3 due to the induction action with the magnetic field generated by the driving force causes the diaphragm 2 integrated with the coil 3 to drive and vibrate.

When the use environment of the speaker 1 is, for example, near the water surface, it is necessary to shield the electric circuit 4 from the external environment such as waterproof. At this time, means for sealing the entire speaker 1 with a casing or the like, or shielding only the electric circuit 4 with a casing or the like is employed.

[0005]

However, the speaker 1
When the whole is sealed by a casing or the like, the diaphragm 2 is vibrated in the space inside the casing, and the vibration generated from the diaphragm 2 is significantly reduced when the diaphragm 2 goes outside through the casing. When only the electric circuit 4 is shielded, a hole must be provided in a casing or the like in order to supply a sound electric signal to the diaphragm 2.

The present invention has been made in view of the above circumstances, and aims to achieve the following objects. To shield the electric circuit from the outside space. To easily transmit the vibration of the diaphragm to the outside space. Improve the shielding effect such as waterproofing.

[0007]

The present invention has a magnetic field generating unit and a sounding unit that sounds by interacting with a magnetic field generated from the magnetic field generating unit and vibrates by vibrating. Shielded from The sounding unit is located in an outer space of the casing. The magnetic field generator
The electric circuit unit includes an electric circuit unit that includes a sound source and an amplifier circuit that amplifies a sound or voice electric signal supplied from the sound source, and an air-core coil that generates a magnetic field based on an output signal of the electric circuit unit. The sounding unit has a magnetic body such as a permanent magnet that vibrates by interacting with a magnetic field generated from the air-core coil, and a diaphragm fixed integrally with the magnetic body. The casing is formed from a non-magnetic material.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker according to the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 10 denotes a speaker, 11 denotes a casing, 20 denotes a sounding unit, 21 denotes a diaphragm, 31 denotes an air-core coil,
40 is a magnetic field generator, 41 is a sound source, 42 is an amplifier circuit, 43
Denotes an electric circuit unit, 51 denotes a lead wire, 61 denotes a magnetic body (permanent magnet), and 7 denotes a speaker unit.

As shown in FIG. 1, the speaker 10 includes a magnetic field generator 40 and a magnetic field B generated from the magnetic field generator 40.
Sounding unit 20 that sounds by interacting with and vibrating
And the magnetic field generating unit 40 is
1 and is arranged in a state of being shielded from the external space S.

The casing 11 is made of, for example, a non-magnetic material such as plastic and has a waterproof property. The casing 11 shields the inside from the external space S, for example, by waterproofing. A magnetic field generation unit 40 including the electric circuit unit 43 and the air core coil 31 is provided.

A magnetic field generating section 40 includes an electric circuit section 43 including a sound source 41 and an amplifying circuit 42 for amplifying a sound or voice electric signal supplied from the sound source 41, and an electric signal output from the electric circuit section 43. And an air core coil 31 for generating a magnetic field B. Electric circuit part 43 and air core coil 31
Are connected via the lead wire 51.

The sound source 41 is a microphone, a tape recorder, or the like, and outputs a low-frequency electric signal in an audible frequency range of 100 Hz or less. Amplifier circuit 42
Amplifies the electric signal output from the sound source 41 and outputs the amplified signal to the air core coil 31.

The air-core coil 31 is connected to an amplifier circuit 42 by a lead wire 51 and generates a magnetic field B by an electric signal output from the amplifier circuit 42. The air-core coil 31 is fixed to the casing 11, for example.

The sounding section 20 is disposed in the outer space S of the casing 11, and vibrates by interacting with a magnetic field B generated from the air-core coil 31, and is integrated with the magnetic body 61. It has a configuration having a fixed diaphragm 21.

The magnetic material (permanent magnet) 61 is a ferromagnetic material such as a permanent magnet, and is formed to be thin and lightweight. The permanent magnet 61 is disposed outside the casing 11 as a position facing the air core coil 31 integrally with the diaphragm 21. The diaphragm 21 is connected to the casing 11 by connecting means (not shown).
It is arranged to be able to vibrate outside.

The speaker unit 7 includes an air core coil 31
And the permanent magnet 61 and the diaphragm 21.

Next, a case in which the speaker 10 having such a structure is sounded will be described.

First, in the magnetic field generating section 40, the sound source 41 of the electric circuit section 43 outputs a sound or voice electric signal to the amplifier circuit 42, the electric signal is amplified by the amplifier circuit 42, and the electric signal is The signal is output to the air-core coil 31 of the speaker unit 7 via 51.

In the speaker unit 7, the air-core coil 31 of the magnetic field generator 40 generates a magnetic field B based on the output electric signal, and the magnetic field B passes through the casing 11 and reaches the vicinity of the sounding section 20. This magnetic field B and the permanent magnet 61
The magnetic field generated by the
Vibrates, and the vibrating plate 21 integrated with the permanent magnet 61 vibrates, so that the sounding unit 20 sounds, and as a result, the speaker 10 emits sound.

Such a speaker 10 includes a lead wire 5
Since there is no need to dispose 1 and the like through the casing 11, it is possible to easily shield the electric circuit portion 43 such as waterproofing, and it is possible to improve the shielding effect such as waterproofing.

Since there is no need to make a hole in the casing 11, the permanent magnet 61 and the diaphragm 21 may be connected to each other, for example, when it is necessary to insulate the electric circuit section 43 or the lead wire 51 or the connection cable under water. The shielding effect can be obtained only by mounting only the sounding portion 20 outside.

[Embodiment] As shown in FIG. 2, the speaker 10 of the present invention can be used as a buoyant waterproof radio with water (water surface) WL.

When the speaker 10 is used as a waterproof radio, since the magnetic field generating section 40 is shielded by the casing 11, the speaker 10 can emit sound even if it receives some water on the water (water surface) WL.

Further, the speaker 10 of the present invention can be carried underwater when performing scuba diving or the like, and can be used as a transceiver capable of having a conversation with another person on the water surface.

[0025]

According to the speaker of the present invention, the following effects can be obtained. (1) Since the air-core coil is located inside the casing, and the magnetic field generation unit including the sound source, the amplification circuit, and the air-core coil is shielded from the external space by the shield, the electric circuit unit including the sound source and the amplification circuit Can be shielded from the outside space. (2) Since the sounding portion composed of the diaphragm and the permanent magnet is located in the outer space of the casing, the vibration of the diaphragm can be easily transmitted to the outer space and a sufficient volume can be obtained. be able to. (3) As described above, the shielding effect such as waterproofing can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a speaker according to the present invention.

FIG. 2 is a front view showing an example of use as a waterproof radio on the water surface.

FIG. 3 is a block diagram showing a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Speaker 11 ... Casing 20 ... Sounding part 21 ... Diaphragm 31 ... Air core coil 40 ... Magnetic field generation part 41 ... Sound source 42 ... Amplification circuit 43 ... Electric circuit part 51 ... Lead wire 61 ... Magnetic body (permanent magnet) 7 ... Speaker unit B: Magnetic field S: External space

Claims (5)

[Claims] 1. A magnetic field generating part (40), and a sounding part (20) that sounds by vibrating by interacting with a magnetic field (B) generated from the magnetic field generating part, wherein the magnetic field generating part is a casing. (11) A speaker which is sealed by (11) and shielded from an external space (S). 2. The sounding section (20) includes a casing (11).
The speaker according to claim 1, wherein the speaker is arranged in an external space (S). 3. An electric circuit unit (43) in which a magnetic field generating unit (40) includes a sound source (41) and an amplifier circuit (42) for amplifying a sound or voice electric signal supplied from the sound source.
And an air-core coil (31) for generating a magnetic field according to an output signal of the electric circuit unit.
Or the speaker according to 2. 4. The sounding unit (20) includes an air core coil (31).
A magnetic body (61) that vibrates by interacting with a magnetic field (B) generated from the magnetic body (61), and a diaphragm (21) fixed integrally with the magnetic body (61). 3. The speaker according to any one of items 1 to 3. 5. The loudspeaker according to claim 1, wherein the casing is made of a non-magnetic material.